NAS1790-4R21

View detailed technical data, stock status, and sourcing information for: NAS1790-4R21
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-01-678-0624

Item Name Code

06666

Assigment Date

01/18/2019 (7 years ago)

A rigid item designed to suspend, support, retain and/or position vehicular component and/or attachment items. Do not use if a more specific item name exists.

flat countersunk head style, right-hand thread direction, 3a thread class, 0.425 inches nominal thread length, 1.7375 inches nominal fastener length

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class: 3a
Thread Direction: right-hand
Thread Length: 0.425 inches nominal
Fastener Length: 1.7375 inches nominal
Head Style: flat countersunk
Head Diameter: 0.506 inches maximum
Head Height: 0.111 inches nominal
Internal Drive Style: offset cruciform (torque set)
Nominal Thread Diameter: 0.2500 inches
Thread Quantity Per Inch: 28
Countersink Angle: 99.0 degrees minimum and 101.0 degrees maximum
Part Name Assigned By Controlling Agency: bolt, 100 degree flush head, 160 ksi uts
Material: steel comp 4140 and steel comp 4340 and steel comp 8740 overall
Surface Treatment: cadmium overall
Surface Treatment Document And Classification: nas1790 national std single treatment response overall
Thread Series Designator: unjf
Specification/Standard Data: 80205-nas1790 national std/spec

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
NAS1790-4R21	Internal Wrenching Bolt

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 5306-01-678-0624?

The FSCG of the NSN 5306-01-678-0624 is 5306

Does the NSN 5306-01-678-0624 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-01-678-0624 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 5306-01-678-0624 contain precious materials?

Item does not contain precious metal.

Does NSN 5306-01-678-0624 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 5306-01-678-0624 was assigned to the Federal Catalog?

It was assigned 7 years ago, on Fri, Jan 18, 2019